/Engine/Source/Runtime/UMG/Public/Components/ListViewBase.h
Default behavior is to check the delegate, then fall back to the default if that fails. Feel free to override directly in child classes to determine the class yourself.
virtual [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UUserWidget](API\Runtime\UMG\Blueprint\UUserWidget) > GetDesiredEntryClassForItem ( ItemType Item ) const